Effects of the Junction Temperature on the Dynamic Resistance of White LEDs

Gacio, D.; Alonso, J.M.; Garcia, J.; Perdigão, M. S.; Saraiva, E. S.; Bisogno, F.E.

doi:10.1109/tia.2013.2243092

Cited by 48 publications

(12 citation statements)

References 17 publications

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“…Thus, coefficient k v can be found to be -25.4 mV/ºC, i.e., the angular coefficient extracted from the linear fitting curve. According to [16], the dynamic resistance variation does not present significant impact on the characteristics of lowcurrent discrete LED devices. Therefore, this parameter is often neglected, since the resistance can be considered constant over a wide range of temperature values.…”

Section: A Electrothermal Basicsmentioning

confidence: 99%

“…To estimate the weight and cost of such improved heatsink, Table III presents an evaluative study regarding two heatsink models from Ursa Lighting/Starlite LED, i.e., up to 600-W [17] and 320-W [23], respectively, while also compared to a 500-W theoretical heatsink. This model has been estimated by means of the aforementioned real devices physical parameters, while considering their weighted average values from (16). Thus, the size, weight and cost of the estimated 500-W heatsink is significantly lower when compared to its 600-W counterpart.…”

Section: Ehc Cob Led Ipet Model Experimental Validation and Discumentioning

confidence: 99%

See 1 more Smart Citation

Improved Photoelectrothermal Model with Thermal Parameters Variation Applied to an Extra-High Current COB LED

Pereira¹,

Tavares²,

Almeida³

et al. 2019

Revista Eletrônica de Potência

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This work is mainly concerned with the improved photoelectrothermal (IPET) modeling of an extra-high current (EHC) and extra-high luminous flux (up to 60 klm) solid-state light source based on a chip-onboard (COB) light-emitting diode (LED). The studied COB technology presents the particular challenge of extremely small thermal resistances, with extra-high current levels through the lamp (up to 12 A). Considering the unique thermal characteristics of such devices, an improved PET modeling and its respective experimental methodology are detailed. Accurate techniques are also proposed to estimate the device junction temperature. The studied method is very suitable to represent EHC COB devices, since it includes the main thermal parameters variation into a novel model, optimizing the flux prediction for this technology. In this context, the static flux and efficacy are analyzed by means of experimental tests and theoretical model, where the improvement of the employed method is highlighted.

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Section: A Electrothermal Basicsmentioning

confidence: 99%

Section: Ehc Cob Led Ipet Model Experimental Validation and Discumentioning

confidence: 99%

Improved Photoelectrothermal Model with Thermal Parameters Variation Applied to an Extra-High Current COB LED

Pereira¹,

Tavares²,

Almeida³

et al. 2019

Revista Eletrônica de Potência

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“…O comportamento da tensão em função da temperatura da junção e da corrente em um LED pode ser descrito pela equação de Shockley, adicionando o efeito da resistência parasita série, através da variável Rs, como mostra (1) [ [13,16,17].…”

Section: Modelo Eletrotérmicounclassified

Metodologia de Projeto Eletrotérmico de Leds Aplicada ao Desenvolvimento de Sistemas de Iluminação

Bender¹,

Iaronka²,

Vizzotto³

et al. 2013

Revista Eletrônica de Potência

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Resumo -Este trabalho apresenta uma metodologia de projeto eletrotérmico de diodos emissores de luz (LEDs) que tem o objetivo de proporcionar indicativos do melhor ponto de operação do LED, considerando seus aspectos térmicos, elétricos e fotométricos. A metodologia está baseada em um modelo eletrotérmico e através de uma análise matemática apresenta resultados teóricos para o projeto de sistemas de iluminação. Exemplos de projeto são desenvolvidos, os resultados teóricos são comparados com simulações computacionais da dinâmica dos fluidos utilizando o método de elementos finitos e por fim comprovados através de resultados experimentais. Palavras-Chave -Diodos Emissores de Luz, Elementos Finitos, FluidodinâmicaComputacional, Modelo Eletrotérmico, Projeto Térmico, Transferência de Calor. LED ELECTROTHERMAL DESIGN METHODOLOGY APPLIED TO LIGHTING SYSTEMSAbstract -This work presents a LED electrothermal design methodology. The methodology aims to provide indicatives of the optimal LED operating point for lighting systems design, considering electrical, thermal and photometrical system features. Different projects are developed according to the methodology, the theoretical results are compared with fluid dynamics simulation and demonstrated by experimental results. 1

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“…Therefore, several dc – dc converters have recently been proposed to feed power LEDs . The simulations of these systems must be carried out with a reliable LED model so that the complete system behaviour can be investigated . For that reason, an LED model that represents the electrical behaviour of the power LED with acceptable accuracy and with a simple parameter estimation process will be an excellent tool for electronic engineers, in order to perform a suitable analysis and simulation of power LED–dc–dc converter systems.…”

Section: Introductionmentioning

confidence: 99%

“…LED modelling commonly requires advanced physics knowledge (electronic structure, optical and thermal properties) to develop a suitable model . Also, the parameter estimation in some complex models is complicated due to the fact that in certain cases it requires complex laboratory tests , while some of these tests require sophisticated equipment, as for example an integrating sphere with an spectrometer . Therefore, a simplified electrical model of power LEDs is proposed in this paper, in order to obtain acceptable simulation results of LED–dc–dc converter system simulations with a feasible parameter extraction process.…”

Section: Introductionmentioning

confidence: 99%

Simplified electrical modelling of power LEDs for DC–DC converter analysis and simulation

Osorio

Alonso

Pinto

et al. 2017

Circuit Theory & Apps

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SUMMARYThis paper presents a model of power light emitting diodes (LEDs) based on electrical variables and considering the concept of LED 'equivalent resistance', which has previously been used in discharge lamp modelling and is suitable to achieve fast simulations of LED converter systems. The model can be obtained with only some simple electrical measurements, thus making its implementation quite straightforward. The proposed model is oriented to the electronic engineering area, and it has special application for the simulation of the electrical behaviour of LEDs and dc-dc converter systems by using software like Simulink. In addition, the proposed model can also be employed for the theoretical analysis and design of LED drivers. Experimental and simulation results are obtained proving the feasibility of the proposed model.

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Effects of the Junction Temperature on the Dynamic Resistance of White LEDs

Cited by 48 publications

References 17 publications

Improved Photoelectrothermal Model with Thermal Parameters Variation Applied to an Extra-High Current COB LED

Improved Photoelectrothermal Model with Thermal Parameters Variation Applied to an Extra-High Current COB LED

Metodologia de Projeto Eletrotérmico de Leds Aplicada ao Desenvolvimento de Sistemas de Iluminação

Simplified electrical modelling of power LEDs for DC–DC converter analysis and simulation

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